Method of rolling



Oct. 6, l1 931. Y P. F. LoNGNEcKl-:R 1,826,622 v METHOD 0F ROLLING Filed Oct. -12 1929 @M /QMMIL /944 caga Patented l oct. e, 1931 PATENT LING STEEL COMPANY, or Malin-usrour,l PENNSYLVANIA, n ConPonATIoN or rENNsYLvANIA y This invention relates vgenerally toa method of 'rolling bodies,"such as ingots, blooms or billets, and more particularly to rolling n such bodies having deep grooves ytherein to "form sections substantially free from reentrant surfaces. f

Many attempts have been made heretofore to provide an ingot of a shape thatwill de- ,Tcreaseor eliminate the objectionable shrinks, 1U' pipes 'and coarse open structure 'usually found in' steel ingots. 1 have found that if an ingot is cast== having deepl grooves therein, the amount of shrinks, pipes mi and coarse open crystalline structure ismuch 15 less than iff'the ingot'has plainsurfaces. I haveffound that if 'an ingot inthe shape of a cruciform', for example, is cast, it may be rolled lso as to makeit substantially free from .reent'rantsurfaces AVVAn ingot cast with deep' grooves therein has the advantagel over other shaped ingots that it: is relatively` free from the objectionable pipes, shrinks-andcoarse or open crystallinestructure.

necessary yto transform the ingot into a sec- 5 tionlsubstantially 1free Vfrom reentrant surfaces. l Forfillustrative purposes, I have shown a cruciform ingot, but it will be understood that the invention is also vapplicable to all ingots which are deeply grooved: The vcruciform 'ingot shown in Figure :l comprises flanges 1,fseparated by deep grooves 2l and 3. 'The ingotjhas two long `nesfllajt and t". 4', and two short axes,y 5, 5 and' 5', 5f.' The ingot shown" inFigure 1-is fed toJ reducing rolls 65,1(fa's shown in Figure@ ,in order to hatten the edges "7 of the flanges 1 TheV ingot is fed to the rolls`6`with a short axis 5, 5extend ing (longitudinally/of lthe rolls. vvAfter the ingot has passed through the rolls, it is This invention relates particularly to a` ,METHOD or noLLfNe n fappiicauonniea october 12, 192e. serial No. 399,257.

rotated through substantially 90.v and fed through rolls 8 (see Figure'3) which Hatten the edges 9 of the ingot.y The ingot having its edges flattened is then fed through rolls 10, which reduce the cross section thereof and tend to close the grooves 2. The ingot is then rotated through 90 and is fed to rolls 11 (see Figure 5), which further reduce the cross section thereof and tend to close the grooves 3. Y c

This process of passing theingot through reducing rolls which tend to close the grooves 2 and 3' and rotating the ingot through'Q()o between successive passes is carriedV out until there is danger that the flanges 1 would over lap if the reducing step were carried any further. This reductionlof the cross section of the ingot and the closing of the grooves 2 and 3 is preferably carried out by passing thel ingot between rolls having substantiallyplain or smooth surfaces.- Y f When the rolling process has been carried to a point where there is `dangerr that the flanges 1 of the ingot will overlap, itis passed between rolls 12, provided with ribs 13, which contact with the grooves 2 in the ingot andy widen them out. The ingot is then rotated through 90 and passed between rolls 1st,*pro^ vided with ribs 1`5,which Contact with and widen out the grooves 3." The ingot is then passed between other sets of rolls which are similar torolls 14.- but each succeeding roll having a rib of decreasing size, and between each pass the ingotis rotated through 90. Thus from the last mentioned rolls,'the ingoty passes to rolls 16, is rotated 90, andy then to rolls 17, in which the rib has' decreased to, such an extent that it is substantially a smooth or plain roll.. Thereafter the rolling is continued in any desired manner. f f

In the method above described, the. ingot, is subjected to rolling` pressure in such direction as to reduce the cross section thereof and to tend to close the groovesl 2 andV 3. This step is followed by passing they ingot between grooved rolls which reduce they cross section of the ingot and widen out the grooves. The step of closing the grooves is carried out by passing the ingot between smooth rollsy and the widening ofthe grooves is carried out by Vpassingthe ingot'between grooved rolls. In

some cases, it may be desirable to first roll the ingot in such a manner as to tend to close .the grooves 2 and 3, as illustrated in Figures 2 to 5,'then Widen the grooves, as illustrated in Figures 6 and 7, then again roll the ingot so as to tend to close the grooves, andrthen again widen the grooves. The present inven tioncontemplates not only a single rolling step or series of steps tending to close: the

` grooves and asingle rolling step or series of steps-tending to widen the grooves, but

- contemplates any number of closing and wideningsteps or series ofsteps.

The above described process enables one to cast an ingot having deep grooves therein Y which results in an ingot' relatively free from shrinks, pipes' and Acoarse crystalline structure, and to thereafter roll the ingot so that it has a cross section substantially free fromV reentrant surfaces. y

In the claims the term edofm ,1s'used to denne the method of rolling in which the body is rotated through substantially 90 between Y passes.

I have illustrated and'described the presf entpreferred embodiment of my invention,

` but itwill be understood that the invention may be otherwise embodied or practiced with in the scopeof the following claims.

Iclaim: n l o l v 1.3In the method ofl rolling a deeply grooved body to a section substantially free from reentrantv surfaces, the steps comprising applyingrolling pressure to fthe body in direction tending to reduce the cross section thereof and to close the grooves, widening the grooves before laps have formed,yand cono tinuing the rolling.

2.. In the method f of rolling a deeply ,grooved body toa section substantially free from reentrant surfaces, the lstepsl comprising applying rolling pressure with substantially smooth rolls to the Vbody in direction tending to reduce the crosssection thereof and to close the grooves, widening the .grooves before laps have formed, and continuing the rolling. r

3.- In the method of rolling a deeply groovedbody to a sectionsubstantially free from reentrant surfaces, the l'steps comprising applying rolling pressure to the bodyv in direction tending to reduce the cross section thereof'V and to close the grooves, engaging the grooves before laps have formed with ribs o'n the rolls to widen them, and continuin l ythe Y rolling.

4. In the method of rolling a deeply grooved body to a section substantially free from reentrant'surfaces, the steps comprisingapplying rolling pressure to the body with substantially smooth rolls in direction tending tocreduce the cross. section thereof and to close the grooves, engaging the grooves before laps have formed with ribs on the rolls to Widen them, and continuing the rolling.

5. In the method of rolling a deeply grooved body to a section substantially free .from reentrant surfaces, the steps comprising feeding the body to a reducing pass with the central plane of a groove in the body extending axially of the rolls forming the pass, and feeding the same to a pass having a ribbed rolleifective for widening the groove.U

6. In the method of rolling a deeply grooved body to a section substantially lfree from reentrant surfaces,the steps comprising feeding the body to a reducing pass ywith the central planeof a groove in the body extending axially of therolls forming the pass, edging the reduced` body, and feeding the Vsame to a pass having a ribbed roll effective for widening the groove. Y Y

7. In -the method of rolling a deeply grooved body to a section substantially free from reentrant surfaces, the steps comprising applying rolling pressure to the body in direction tending to reduce the cross section thereof and to close thegrooves, and feeding the same through passes having ribbed rolls, the ribs decreasing in size in the successive passes. Y y Y Y 8.V In the 'method of rolling a Vcruciforml short axis of the body extending longitudinally ofthe rolls, said reductiontending to reduce the grooves between the flanges of the body, edging the reduced body, and widening the grooves before laps have formed. v

10. In the method of rolling a cruciform body toa'section substantially free from reentrantsurfaces, the steps comprising feed# ing the body through reducing rolls with a short axis ofthe body extending'longitudi'- nally of the rolls, rotating the body through substantially 90 and feeding it throughlreducing rolls with the other short vaxis of thek body extending longitudinally of the rolls. said reductions vtending to reduce the grooves between the flanges ofthe body, and-widening the grooves before laps have formed.'

11. In the method of rolling a cruciform body to a section substantially free from reentrant surfaces, the steps comprising feeding the body through reducing rolls .wit-hak short axis of the body extending longitudinally ofthe rolls, rotating thebody through substantially 90 andfeeding it through Vre`V ducing rolls with the other short axis of the body extending longitudinally of the rolls, said reductions tending to reduce the grooves between the flanges of the body, and widening the grooves before laps have formed by feeding the body through passes having ribbed rolls which contact with the grooves. 12.,In the method of rolling a cruciform body to a section substantially free from reentrant surfaces, the steps comprising feeding the body between substantially smooth reducing rolls with a short axis of the body extending longitudinally of the rolls, rotating the body through substantially and feeding it between substantially smooth reducing rolls with the other short axis of the body extending longitudinally of the rolls, said reductions tending to reduce the grooves between the anges of the body, and widening the grooves before laps have formed.

13. In the method of rolling a cruciform body to a section substantially free from reentrant surfaces, the steps comprising feeding the body between substantially smooth reducing rolls with a short axis of the body extending longitudinally of the rolls, rotating the body through substantially 90o and feeding it to substantially smooth reducing rolls with the other short axis of the body extending longitudinally of the rolls, said reductions tending to reduce the grooves between the flanges of the body, and widening the grooves before laps have formed by feeding the body through passes having ribbed rolls which Contact with the grooves.

14. The method of forming an ingot substantially free from reentrant surfaces, comprising casting a deeply grooved ingot, applying rolling pressure to the ingot in a direction tending to reduce the cross section thereofrand to close the grooves, widening the grooves before laps have formed, and continuing the rolling.

l5.V The method of forming an ingot substantially free from reentrant surfaces, comprising casting a cruciform ingot, applying rolling pressure to the ingot ina direction tending to reduce the cross section thereof and to Close the grooves, widening the grooves before laps have formed, andi continuing the rolling.

In testimony whereof I have hereunto set my hand.

PAUL F. LONGNECKER. 

